Adjusting mechanism for calipers



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J. J. BYRNE. ADJUSTING MECHANISM FOR GAL IPERS.

Patehted June 19,1883.

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UNITED" STATES PATENT ()FFICE.

JOHN J. BYRNE, or CHICAGO, ILLINOIS.

ADJUSTING MECHANISM FOR CALIPERS.

SPECIFICATION forming part of Letters Patent No. 279,534, dated June 19, 1883, Application filed February 12, 1883. (Xommlcl To aZLu/lwm it may concern.-

Be it known. that I, JOHN J. BYRNE, a citi zen of the United States, residing at Chicago, in the count-y of Cook and State of Illinois, have inyented a certain new and useful Improvement in Adjusting Mechanism for Me chanics Tools; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art'to make and use the same, reference being had to .the accompanying drawin s, forming a part of this specification.

This invention has for its object, first, the adjustment in a rapid and accurate manner of the adjustable measuring or indicating porti 011s of mechanics tools-such as calipers, di viders, surface-gages, bevelsquares, &c.; second, in an improved construction by which wear of the adjusting mechanism can be readily and effectively taken up; and my invention consists, first, in the provision, in connection with such tools, of a worm-wheel and endless screw or worm for effecting an accurate adjustment of the parts, the arrangement being such that the operating-screw is attached to one member of such tools, and the other member is attached to theworm-wheel by friction, all as will hereinafter more fully appear; second, in certain details of construction whereby the lost motion caused by the wear of parts in use can be readily taken up, as will hereinafter more fully appear.

In the drawings, Figure l is a front view, with parts broken away, illustrating my improvement applied to apair of calipers. Figs.

2 and 3 are enlarged detail cross-sections of.

the same.

Referring to the drawings, A and B repre- A. The other member, B, is attached or joined by friction to the face I) of the worm wheel or disk 0, so as to move with the same when turned by the endless screw 0, and yet permit of an adjustment independent of such screw adjustment when desired. By this means the partscan be quickly adjusted by hand to an essential feature of my invention.

caused by wear in use, I journal one end of theendless screw 0 in a turnin head, or hearing, D, and the other end in a head or bearing, 1), capable of adjustment toward the worm wheel' C, as indicated in Fig. 1, and said head is locked to its adjustment by means of a screw or bolt, (1, passing through a slotted extension of the head I), the slot (1 being of an elongated form to permit of the adjusting movement above mentioned taking place. Lost motion endwise of the endless screw 0 is taken up by means of a center j onrnal-screw, c, having bearing in the head I), as shown in Fig. 1.

\Vhile in the drawings I have shown my invention applied to a pair of calipers, the construction is applicable to the usual adjustable mechanics tools-such as surface-gages, ad-

justable bevels, &c.-the adjusting mechanism remaining the same, while the detail form of the two members A B is made to conform to the shape of the tool to which my improve ment is applied.

I am aware that prior to my invention calipers have had their legs adjusted by means of an endless screw and worm-wheel; but as so constructed no movement of the legs independent of the screw adjustment was permis-' sible, and which independent adjustment-is an I therefore do not claim, broadly, an endless screw and worm-wheel adjustment for mechanics tools; 0

but

IVhatI do claim as my invention, and desire to secure by Letters Patent, is

1. In an adj usting mechanism for mechanics tools, the combination of the member B, se 5 cured to and moving with the worm-wheel G by friction contact, and the member A, provided with journals for the endless operatingscrew 0, as described, and for the purpose set forth.

2. I11. an adjusting mechanism for mechanics tools, as herein described, the combination of the turning head D, adjustable head D, end- In testimony whereof witness my hand this less screw c, and worm-Wheel O, as described, Sthday-of July, 1882, atOhicago, Cook county, IO and for the purpose set forth. Illinois.

3. In an adjusting device for mechanics T Y- T tools, as herein described, the combination of BX RB the turning head D, adjustable head D, jour- In presence ofnal-serew e, endless screw 0, and wornrwheel J AMES H. COY'NE, Y

O, as described, and for the purpose set forth. I CHAS. H. SCHOFF.. 

